Privacy Policy

The short version

No accounts, no ads, no tracking. Photos are uploaded for AI analysis only when you ask for a verdict, and our server does not keep them. Knock sounds are analysed on your phone; recordings never leave it.

Photos

When you take or choose a photo, the app compresses it and sends it to our server, which forwards it to Anthropic (Claude)'s AI model for analysis and returns the result to you. Our server handles the photo only for that one request; it does not store it or use it for anything else. Anthropic (Claude) processes the data under its API terms (see its privacy policy).

Please don't photograph faces, documents or other personal information.

Sound

The watermelon knock test uses the microphone. Sound is analysed live on the phone, and only four numbers (knock count, main frequency, spectral centroid, decay time) are sent along with the photo. The raw recording is never saved or uploaded.

History

Your history (photo thumbnails and verdicts) is stored only on your phone. You can delete it in the app at any time; deleting the app removes it too.

Network and security

To prevent abuse, the server applies a short-term request limit per IP address. IP addresses are not kept long-term or linked to your identity.

What we don't do

• No sign-up or login
• No collection of names, phone numbers, location or contacts
• No advertising or third-party analytics
• We never sell any data

Contact

Questions about privacy: glzhao97@gmail.com